Understanding a Learning Goal or Standard


LS2 (9-11) -3 - GSE adopted by Jen Hawkins
Students demonstrate an understanding of equilibrium in an ecosystem by …

3a defining and giving an example of equilibrium in an ecosystem.

3b describing ways in which humans can modify ecosystems and describe and predict the potential impact (e.g. human population growth; technology; destruction of habitats; agriculture; pollution; and atmospheric changes).

3c describing ways in which natural events (e.g. floods and fires) can modify ecosystems and describe and predict the potential effects.


What do these GSEs mean? What subtopics do students need to address to understand these GSEs?

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Concepts in 3a
  • Understanding systems (open/closed)
  • Equilibrium of natural cycles in an ecosystem
    • Carbon Cycle
    • Nitrogen Cycle
    • Water Cycle
  • Carrying Capacity
Concepts in 3b
  • Different ways ecosystems can be altered
    • Pollution
    • Deforestation
    • Habitat loss
    • Over-exploitation
    • Introduced/Invasive species
  • Effects of altering an ecosystem
  • Effects that damage to one ecosystem might have on a global scale
    • Global Warming/Climate Change
    • Loss of Ozone Layer
  • Carbon footprints
  • Note: This GSE seems closely related to LS4 (9-11) -9.
Concepts in 3c
  • Understanding ecological succession


Human Impacts on Resources
A. Population Growth
  • Exponential growth
  • Carrying Capacity
  • Density Dependent Factors vs. Independent Density Factors
    • Disease, Predators, Competition
B. Human Impact on Land
  • Mining
    • Surface Mining
    • Underground Mining
  • Forestry
    • Deforestation
    • Soil Erosion
  • Urban Development
    • Solid Waste
      • Landfills
      • Reusing, Recycling, Reducing
  • Agriculture
    • Pesticides
C. Human Impact on Air
  • Global Warming
  • Ozone Depletion
  • Photochemical Smog
  • Coal Burning
  • Acid Precipitation
  • Controlling the Source
D. Human Impact on Water
  • Water Conservation
  • Water Pollution
    • Pollution of Ocean
    • Pollution of Groundwater
  • Reducing Water Pollution
    • The Safe Drinking Water Act
    • The Clean Water Act


What ideas to students need to understand before they can address the topics described above?

  • What equilibrium means
  • The definition/concept of an ecosystem
  • Definition of:
    • Pollution
    • Deforestation
    • Habitat Loss
    • Over-exploitation
    • Introduced/Invasive Species
  • Humans have an impact on ecosystems
  • Biotic and abiotic factors of an ecosystem and the differences between the two
  • Ecosystems have different cycles (i.e. carbon, nitrogen, water, etc)

What misconceptions are students likely to have about these topics?

  • Climate change and the loss of the ozone layer are pretty much the same thing.
  • Aerosol spray cans are a major contributor to climate change.
  • General pollution and toxic chemicals are major contributors to climate change.
  • The space program is a major contributor to climate change because it punches holes in the atmosphere.
  • Using nuclear power causes climate change.
  • Humans do not impact nature because we don't live in nature.
  • Humans are the only influence on ecosystems.
  • Global warming only affects the polar regions
  • Global warming will make all of the earth warm
  • Pollution is only in the air

What phenomena and representations help students understand these topics?

  • videos: "An Inconvenient Truth
  • Carbon Footprint Calculator
  • news articles regarding natural disasters


This is video on its own page.

What activities or activity sequences can be used to address these GSEs?


Released NECAP items

News Related to Climate Change


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Delicious/fogleman/Climate_Change* World Wildlife Fund: A Leader in Polar Bear Conservation by fogleman Dec 9, 2009 4:54 pmThe WWF polar bear status page. This page features links to several reports on global warming and the effects man has on polar bears.